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I focus on building reliable systems and enjoy digging into complex issues — performance tuning, disaster recovery, root cause analysis, and solving problems that aren't always straightforward. With 20+ years in system administration and infrastructure engineering, I work with both legacy systems and modern environments — from bare metal servers to virtualized and containerized setups. 🚀 Key areas I work with: • Infrastructure setup and migrations (bare metal ↔ VM ↔ cloud) • Troubleshooting and performance tuning (high CPU/load, slow systems, bottlenecks) • Email deliverability (SPF, DKIM, DMARC, spam issues, warmup, mail server reputation restoration) • Virtualization and containerization (VMware, Proxmox, KVM, Docker) • Networking and VPN solutions • Disaster recovery, backup strategies, malware cleaning, and finding the point of intrusion. • Long-term systems support and maintenance 🛠 Legacy Systems & Industrial Equipment Support • Migration and virtualization of legacy systems (DOS, Windows 3.x/9x/NT/2000) • Running outdated software on modern hardware via virtualization • Recovery systems from old working HDD to VM, if native hardware fails. Including industrial PCs. 🔧 Core Expertise • OS: FreeBSD, Linux (CentOS, AlmaLinux, Rocky, RHEL, Ubuntu, Debian, Gentoo), Windows, Windows Server • Virtualization: VMware vSphere, ESXi, Proxmox, KVM, oVirt, VMware Workstation, VirtualBox • Containers & Automation: Docker, Docker Compose, Jenkins, Ansible • Web: Nginx, Apache, LiteSpeed, Tomcat, Lighttpd, Caddy • Databases: MySQL, MariaDB, PostgreSQL, MongoDB • Mail systems: Postfix, Dovecot, Courier Cyrus, Rspamd, Postgrey, PostfixAdmin, SquirrelMail, Roundcube, SPF, DKIM, DMARC, MTA-STS, AWS SES, Mailgun, Sendy • Control panels: WHM/cPanel, VestaCP, Virtualmin, Cyberpanel, and so on 🔐 Networking & VPN • WireGuard, AmneziaWG, OpenVPN, StrongSwan, tinc, mpd5, IPSec, L2TP, IKEv2 • BGP (quagga), Squid (including LDAP and Kerberos auth), DNS (BIND), DHCP, TFTP • Fail2ban, iptables, ipfw, pf, csf 💾 Storage & Backup • TrueNAS Core/Scale, FreeNAS, SAN (iSCSI), ZFS, AWS S3, Backblaze, Wasabi • Veeam Backup & Replication, XSI Backup, rsync, rsnapshot, rclone ⚙️ Other • Samba3 + LDAP, Samba4 (NT4 and AD domains analog, LDAP, domains up to 500 users, GPO, roaming profiles) • Monitoring: Zabbix, Prometheus, Grafana • Services: Memcache, Redis, OpenLDAP, NFS, SVN, Git, GitLab (self-hosted), FTP, SFTP • Platforms: Moodle, Nextcloud, OnlyOffice, BigBlueButton, DAViCal, WordPress, Magento • Remote management: AnyDesk, TeamViewer, Radmin, Ammyy Admin, RustDesk, MeshCentral • Hardware: Dell, HP, Supermicro servers, Dell PowerVault storages • Networking equipment: HP, Dell, 3Com switches • Embedded/firmware: DD-WRT, OpenWRT (including software cross-compiling for ARM on x86_64) • Scripting: Shell scripting, Python, PHP Have an interesting or unusual problem? That's exactly what I enjoy — feel free to reach out. I value long-term collaboration and quality over quick fixes.

My core qualifications: - Planning, deployment, integration and operational support of solutions utilizing a wide range of services and application ecosystems in heterogeneous environments -- from Nginx and Postgres to web parsing frameworks, Windows Terminal Services and Asterisk PBX as some examples. - Experienced with Interpreted Languages including Perl - Understands Compiled languages, including C, C++, C#, and Java. - Strong use of Shell scripting languages, including Bash for Linux and Mac platforms and PowerShell for Windows systems - Facility with development methodologies, including Agile - Excellent configuration management using Puppet Chef and Ansible - Extremely knowledgeable about CI/CIT/CID integration. - Testing and Automation: Cypress, Selenium (Pyton and Java), AutoIT for Windows - Basic analog and digital circuit design - Labcenter Proteus and National Instruments Multisim circuit simulation suites - Eagle PCB layout, basic AVR ATMega MCU programming in C (CodeVison) and Assembly languages HTML and CSS (technical level) - AsteriskPBX

I'm experienced UNIX systems administrator and software developer. Have deep knowledge in GNU/Linux and BSD operating systems. Gentoo Linux power user and contributor, package maintainer. Author of Linux kernel patch for Terminus terminal font support. Started from 2004 worked in many software companies as C and C++ developer. Participated in various commercial projects for Windows and GNU/Linux distributions. Have understanding of such programming paradigms like OOP, C++ templates, functional, imperative programming, scripting. • Developing software in C, C++ according to customer needs • Writing shell scripts in Bash to perform administrative routines • Configuring Linux netfilter firewalls using iptables, IP routing • Deploying and configuring Apache HTTP Server, Postfix MTA, VPNs, SSH • Deploying business apps on various VPS providers like Hetzner, AWS • Resolving Linux issues like kernel panics, boot failures etc. • Maintaining legacy setups and environments, writing documentation • Consulting customers how to implement their business requirements • Consulting customers how to keep Linux environment secure and up to date

Seeking opportunities in Java/Perl/Python oriented development, shell scripting, BSD/Linux administration - to support your business. Java: Spring, Hibernate Perl: Catalyst/Mojo/Dancer, DBIx::Class Python: Django, FastAPI, SQLAlchemy DB: Postgres, MySQL/MariaDB On-hand experience with regular expressions (regexp), REST, and AJAX. I can work well alone and as a team member.

I have been working as a Website WordPress Developer and UX/UI Graphic Designer since 2014 years. Expert WordPress Development and Software Development services to build high-performing websites. Need help? I can fix bugs, optimize performance, and enhance functionality with ease. Get professional solutions today! webcodewp.com/our-works ---------- My Skills ---------- Optimization was performed for TTFB, FCP, LCP, FID, CLS and other metrics. Tweaking PHP code in plugins or themes is an everyday practical experience. Moderate experience with woocommerce and related plugins. Hav a little experience with Angular based UI modification. Laravel framework is now in the process of intensive study. Frameworks: Zend, Symphony (Legacy), Kohana, Yii, CodeIgniter, Ruby on Rails ... Graphic web designer - Phptoshop PSD GIF - Adobe XD Converting - Phptoshop PSD to WordPress - Adobe XD to WordPress WordPress Page Builder plugin - Elementor Pro, Gutenberg, Fusion Page Builder, Visual Composer, Oxygen Builder, WPBakery, Divi, Beaver Builder, Brizy, SiteOrigin, Shortcodes Ultimate, Cornerstone, Advanced Layout Builder, UX Builder, Variant Page Builder Wordpress Theme - OceanWP, Astra Pro, Hestia, Neve, Rife, BeTheme, Storefront, Jupiter X, Avada, Genesis Wordpress Blocks Plugin For Gutenberg - Ultimate Blocks, Stackable - Gutenberg Blocks, Getwid, Advanced Gutenberg Blocks (AGB), Gutenberg Essence Pro, Ultimate Addons for Gutenberg, Advanced Gutenberg Wordpress Plugin for WooCommerce - Villatheme for WooCommerce (Cart All In One For WooCommerce, WooCommerce Boost Sales, WooCommerce Notification, WooCommerce Lucky Wheel), Extra Product Options (Product Addons) for WooCommerce Wordpress plugin - Chaty, GA, Media Library, Ninja Forms, Gravity Forms, Ocean Extra, Ocean Social Sharing, Polylang, Rank Math SEO, Sticky Header OceanWP, ShortPixel Image Optimizer, UpdraftPlus, WP Fastest Cache, WP Rocket, WP Maintenance Mode, WP Translitera, Yoast SEO, WooCommerce, Rate my Post – WP Rating System, kk Star Ratings Joomla Page Builder - Sp page builder, Yootheme builder, ZOO Coding - CSS, HTML SEO Analysis and SEO optimization with Rank Math SEO plugin. Optimize website to get an A+ grade on GTMetrix and Google PageSpeed test results. Maintenance website - Backup of the website Updraft plugin - Update of the plugins installed - Google Analytics - Google PageSpeed Insights Up - Compress all img for good speed upload website My site - https:// webcodewp.com My previous works WordPress + Elementor + Gutenberg + OceanWP celebritiesstatus.com humanelementsecurity.com kotikmeow.com music-ic.com danshaplandscape.com krillzyme.com clickalpha.com orchids.mk.ua ---------- I Recommend ---------- If you need the Best Software developer, i recommend Alexander M. (C# PHPScript CSS WordPress FreeBSD HTML Perl JavaScript Azure SQL) upwork.com/o/profiles/users/~01d23b45ee98be2596/

⭐️ Top Rated Plus - Top 3% Expert on Upwork 🕒 9000+ Working Hours ✅ 20+ Years of Expertise ✅ 100% Job Success ✅ 300+ Successful Projects Finished ✅ 5 Star Rating Hello, I'm Oleksandr. As a seasoned Linux System Administrator and DevOps Engineer with over 20 years of experience I specialize in delivering robust IT solutions that enhance operational efficiency and security. My expertise spans across various domains, including: ▪ DevOps & Automation: Successfully implemented automated provisioning using Ansible, streamlining deployment processes and reducing manual intervention. ▪ Linux & FreeBSD Maintenance: Managed and optimized server environments on CentOS, Debian, Ubuntu, RHEL, and FreeBSD, ensuring high availability and performance. ▪ Cloud Hosting: Deployed and maintained scalable cloud solutions on AWS, Azure, and DigitalOcean, enhancing infrastructure reliability and scalability. ▪ Virtualization: Utilized Docker, VirtualBox, and OpenVZ to create flexible and efficient virtual environments, supporting diverse application needs. ▪ Web & Database Servers: Configured and maintained Apache, Nginx, MySQL, PostgreSQL, and MongoDB servers, ensuring secure and efficient data handling. ▪ Networking & Security: Implemented secure networking solutions, including VPNs and firewalls, to protect sensitive data and maintain network integrity. I am committed to continuous improvement and staying abreast of the latest industry trends. My approach is rooted in ITIL best practices, ensuring incident management and business continuity planning are at the forefront of my work. Let's collaborate to drive your IT projects to success with innovative solutions and expert guidance.